凸轮轴齿轮至喷油泵驱动齿轮齿隙最小为多小约翰迪尔John Deere柴油机

注意：拆卸约翰迪尔John Deere柴油机凸轮轴时，不必从约翰迪尔John Deere柴油机上拆下气缸盖。如果推杆弯曲或出现过度磨损，可能需要拆下气缸盖，以检查气缸体、气缸盖、凸轮凸角和凸轮从动件。

1.排空约翰迪尔John Deere柴油机机油和冷却液（如果之前未进行）。如本组前面所述，拆下正时齿轮盖。请参阅本组中的拆卸减震器和正时齿轮盖。

2.使用JDE81-1或JDG820飞轮旋转工具旋转约翰迪尔John Deere柴油机飞轮，并使用JDE814正时销将约翰迪尔John Deere柴油机锁定在1号气缸的“TDC压缩”冲程。凸轮轴齿轮和曲轴齿轮上的正时标记（A）应对齐。

如果正时标记未对齐，拆下正时销并继续旋转约翰迪尔John Deere柴油机，直到标记对齐。正时销应进入飞轮的孔中。约翰迪尔John Deere柴油机将锁定在1号“上止点压缩”冲程。

3.拆下摇臂总成和推杆。请参见组020中的拆卸气缸盖序列号（-199999），或参见组021中的拆卸缸盖。

4.在约翰迪尔John Deere柴油机处于翻转架上的情况下拆卸凸轮轴时，将约翰迪尔John Deere柴油机翻转至从动件从凸轮轴凸角（油底壳朝上）脱落的位置，或保持凸轮从动件拆卸凸轮轴

注意：拆卸凸轮轴时，不必从约翰迪尔John Deere柴油机上拆下气缸盖。如果推杆弯曲或出现过度磨损，可能需要拆下气缸盖，以检查气缸体、气缸盖、凸轮凸角和凸轮从动件。

1.排空约翰迪尔John Deere柴油机机油和冷却液（如果之前未进行）。如本组前面所述，拆下正时齿轮盖。请参阅本组中的拆卸减震器和正时齿轮盖。

2.使用JDE81-1或JDG820飞轮旋转工具旋转约翰迪尔John Deere柴油机飞轮，并使用JDE814正时销将约翰迪尔John Deere柴油机锁定在1号气缸的“TDC压缩”冲程。凸轮轴齿轮和曲轴齿轮上的正时标记（A）应对齐。

如果正时标记未对齐，拆下正时销并继续旋转约翰迪尔John Deere柴油机，直到标记对齐。正时销应进入飞轮的孔中。约翰迪尔John Deere柴油机将锁定在1号“上止点压缩”冲程。

3.拆下摇臂总成和推杆。请参见组020中的拆卸气缸盖，或参见组021中的拆卸缸盖。

4.在约翰迪尔John Deere柴油机位于翻车台上的情况下拆卸凸轮轴时，将约翰迪尔John Deere柴油机滚动至从动件从凸轮轴凸角（油底壳侧朝上）脱落的位置，或使用D15001NU磁性固定组件将凸轮从动件从凸角上固定。

正时标记、凸轮轴和曲轴齿轮

A定时标记

使用D15001NU磁性固定装置远离叶片。

正时标记、凸轮轴和曲轴齿轮

A定时标记

5.检查凸轮轴齿轮（A）和喷油泵驱动齿轮（B）的轮齿是否磨损或损坏。齿轮应具有如下最小齿隙：

规格

凸轮轴齿轮至喷油泵驱动齿轮齿隙最小为0.051毫米（0.0020英寸）

注意：拆卸凸轮轴时，曲轴和凸轮轴齿轮上的正时标记应对齐，1号气缸应锁定在“TDC压缩”冲程。

A凸轮轴齿轮B喷油泵驱动齿轮

拆下凸轮轴齿轮

重要事项：将约翰迪尔John Deere柴油机凸轮轴前端推出齿轮时，防止凸轮轴撞击地面。如果让凸轮轴掉落到地板上，可能会损坏凸轮轴。

注意：凸轮轴齿轮压在凸轮轴上。

从凸轮轴上拆下齿轮需要大约10吨的压力。

1.用压力机支撑外凸轮轴齿轮（A）。

2.从凸轮轴上拆下外齿轮。

3.用压力机支撑内凸轮轴齿轮（B）。

4.从凸轮轴上拆下内齿轮。

5.在溶剂中清洁凸轮轴和齿轮。用压缩空气干燥。

拆卸外凸轮轴齿轮

A-外凸轮轴齿轮B-内凸轮轴齿轮测量止推垫圈厚度

1.拆下约翰迪尔John Deere柴油机凸轮轴后，分别检查两个止推垫圈的厚度是否正确。

规格

止推垫圈厚度2.24-2.34 mm（0.088-0.092 in.）

2.更换磨损或损坏的垫圈。

检查和测量凸轮轴从动件

1.检查约翰迪尔John Deere柴油机凸轮轴从动件有无不均匀磨损或损坏。同时检查相应的凸轮轴凸轮有无磨损或损坏。必要时更换。

2.测量约翰迪尔John Deere柴油机缸体中的从动件外径和从动件孔内径。

规格

约翰迪尔John Deere柴油机凸轮轴从动件外径……17.33-17.35 mm（0.682-0.683英寸）

检查凸轮轴从动件时的凸轮轴从动孔区块ID……17.384-17.440 mm（0.6845-0.6865英寸）

更换不符合规格的凸轮从动件。如果任何一个从动件孔不符合规格，则更换缸体。

目视检查凸轮轴

1.在溶剂中清洁凸轮轴。用压缩空气干燥。

2.检查所有凸轮轴凸轮（A）和轴颈（B）是否磨损或损坏。必要时更换凸轮轴。新凸轮轴从动件可与旧凸轮轴一起使用（如果凸轮轴可用）。不要将旧凸轮轴从动件与新凸轮轴一起重复使用。

注：可能会发现非常轻微的刻痕，但如果气门升程在规范范围内，则可以接受。点蚀或磨损要求更换。（见C

1.将凸轮轴支撑在液压机的第一轴承轴颈下方。

2.安装半月键（A）。用LOCTITE润滑凸轮轴前端 51048钼膏。

3.将内齿轮（B）设置在凸轮轴上，止推垫圈表面向内（朝向凸轮轴）。对齐半月键和键槽。

4.将齿轮安装到凸轮轴前端。推上内齿轮，直到其紧靠凸轮轴轴承轴颈。

5.在凸轮轴上设置外齿轮，使正时标记朝上（远离凸轮轴）。对齐外齿轮（D）的半圆键和键槽（C）。

6.将外齿轮推到凸轮轴前端，直到与内齿轮拧紧。

7.在中心支撑凸轮轴的每一端。使用千分表，将柱塞置于凸轮轴齿轮的推力面上。

8.检查内外齿轮止推表面的跳动。

规格

凸轮轴齿轮推力面-最大跳动量……0.10毫米（0.004英寸）

安装凸轮轴内齿轮

A-      半月键B-内齿轮C-键槽D-外齿轮

使用JDG602适配器套件维修凸轮轴衬套

1.检查凸轮轴轴颈和衬套是否磨损或损坏。测量凸轮轴颈和衬套，以确定是否存在适当的油隙。必要时更换凸轮轴和/或衬套。

规格

凸轮轴衬套内径…67.076-67.102 mm（2.6408-2.6418英寸）区块内钻孔69.987-70.013毫米（2.7554-2.7564英寸）

凸轮轴孔跳动……0.038 mm（0.0015 in.）最大凸轮轴轴颈外径……66.987-67.013 mm（2.6373-2.6383英寸）

凸轮轴衬套至轴颈油间隙……0.063-0.115 mm（0.0025-0.0045英寸）拆卸凸轮轴衬套

注意：可以从约翰迪尔John Deere柴油机前部触及前两个衬套。必须拆下飞轮和后凸轮轴孔塞（G）才能接触到其他两个衬套。

2.使用JDG603衬套驱动器（E）和JDG604接收杯（D）以及JDE6凸轮轴衬套更换套件（A和C）中所示的部件拆下凸轮轴衬套（F）。

3.拧紧衬套螺钉端部的螺母，直到衬套从凸轮轴衬套孔中拉出。检查并测量缸体（B）中的凸轮轴衬套孔。对于要更换的其余衬套，请遵循相同的步骤。

凸轮轴后孔塞

A-衬套螺钉（JDE6-1）B-气缸体腹板C-锁衬套（编号25916）D-接收器杯（JDG604）E-衬套驱动器（JDG603）F-凸轮轴衬套G-凸轮轴孔塞使用JDG606适配器套件维修凸轮轴衬套

1.检查凸轮轴轴颈和衬套是否磨损或损坏。测量凸轮轴颈和衬套，以确定是否存在适当的油隙。必要时更换凸轮轴和/或衬套。

规格凸轮轴衬套内径…67.076-67.102 mm（2.6408-2.6418英寸）块内钻孔。。。。69.987-70.013毫米（2.7554-2.7564英寸）

拆卸凸轮轴衬套

凸轮轴孔跳动…….0.038 mm（0.0015 in.）最大凸轮轴轴颈外径…….66.987-67.013 mm（2.6373-2.6383英寸）

凸轮轴衬套至轴颈油间隙…….0.063-0.115 mm（0.0025-0.0045英寸）

注意：前两个衬套可从约翰迪尔John Deere柴油机前部触及。必须拆下飞轮和后凸轮轴孔塞（G）才能接触到其他两个衬套。

在安装到缸体腹板（C）中之前，用清洁的约翰迪尔John Deere柴油机机油润滑JDG608衬套导向器上的O形圈。

2.使用JDG607衬套驱动器（A）和JDG408滑锤适配器（D）（来自JDG405凸轮轴衬套维修套件）拆下凸轮轴衬套（B）。还应使用JDG608衬套导向器（E）和D01299AA滑锤（F）。

注意：缸体前后的端部衬套可以仅用JDG607衬套驱动器和D01299AA滑锤拆下。

3.拆卸衬套时，检查并测量缸体中的每个凸轮轴衬套孔。

凸轮轴后孔塞

A-衬套驱动器（JDG607）B-凸轮轴衬套C-缸体腹板

D-滑锤适配器（JDG408）和E-套管导向器（JDG608）

F-滑锤（D01299AA）G-凸轮轴孔塞

重要事项：安装后，衬套和缸体中的油孔必须对齐。衬套中的细长孔必须朝向顶部。安装后，使用带加长件的小镜子，以确保油孔正确对齐。

4.将新的凸轮轴衬套（B）滑到JDG603衬套驱动器（a）上。将JDG608衬套导向器安装在气缸体腹板（C）的外侧，用衬套驱动器组装D01299AA滑锤（E）和JDG408滑锤适配器（D），如图所示。

5.确保衬套在孔中开始呈方形，油孔与缸体中的孔对齐。用滑锤将衬套拉入孔中，直到正确定位。

6.使用带加长件的小镜子检查衬套与缸体油孔的对齐情况。

7.申请PERMATEX 航空（3号A型垫片）至新凸轮轴孔钢盖塞，并在孔中安装塞。塞子边缘必须位于孔边缘下方。

安装凸轮轴

重要事项：在安装凸轮轴之前，将约翰迪尔John Deere柴油机设置在1号活塞压缩冲程的上止点，以便凸轮轴和曲轴齿轮上的正时标记对齐。

1.如果将凸轮轴从动件与约翰迪尔John Deere柴油机一起在翻车台上拆下，则重新安装从动件，但不要堵塞凸轮轴孔。将约翰迪尔John Deere柴油机滚动至从动件从凸轮轴孔脱落的角度。

注意：如果使用D15001NU磁性固定工具组，将凸轮轴从动件从凸轮轴孔中固定，直到安装凸轮轴。

2.用TY6333或TY6347高温润滑脂润滑止推垫圈（A），并安装在内齿轮后面的凸轮轴上。

3.用TY6333或TY6347高温润滑脂润滑凸轮轴凸轮，并用清洁的约翰迪尔John Deere柴油机机油润滑轴承轴颈。

4.小心地将凸轮轴安装在气缸体中，以使凸轮轴凸轮不会拖入孔中。在安装过程中旋转凸轮轴，以避免任何孔堵塞。

凸轮轴止推垫圈

A型止推垫圈

Remove Camshaft

NOTE: It is not necessary to remove cylinder head from engine for camshaft removal. If push rods are bent or show excessive scuffing, it may be necessary to remove cylinder head for inspection of block, head, cam lobes and cam followers.

1.      Drain engine oil and coolant, if not previously done. Remove timing gear cover as detailed earlier in this group. See REMOVE VIBRATION DAMPER AND TIMING GEAR COVER in this group.

2.      Rotate engine flywheel with JDE81-1 or JDG820 Flywheel Rotation Tool and lock engine at No. 1 cylinder’s “TDC-Compression” stroke with JDE81-4 Timing Pin. Timing marks (A) on camshaft gear and crankshaft gear should be aligned.

If timing marks are not aligned, remove timing pin and continue to rotate engine until marks align. Timing pin should enter hole in flywheel. Engine will be locked at No. 1 “TDC-Compression” stroke.

3.      Remove rocker arm assembly and push rods. See REMOVE CYLINDER HEAD SERIAL NUMBER ( — 199,999) in Group 020, or see REMOVE CYLINDER HEAD SERIAL NUMBER (200,000— ) in Group 021.

4.      When removing camshaft with engine on rollover stand, roll engine to a position where followers fall away from camshaft lobes (oil pan side up) or hold cam followers Remove Camshaft

NOTE: It is not necessary to remove cylinder head from engine for camshaft removal. If push rods are bent or show excessive scuffing, it may be necessary to remove cylinder head for inspection of block, head, cam lobes and cam followers.

1.      Drain engine oil and coolant, if not previously done. Remove timing gear cover as detailed earlier in this group. See REMOVE VIBRATION DAMPER AND TIMING GEAR COVER in this group.

2.      Rotate engine flywheel with JDE81-1 or JDG820 Flywheel Rotation Tool and lock engine at No. 1 cylinder’s “TDC-Compression” stroke with JDE81-4 Timing Pin. Timing marks (A) on camshaft gear and crankshaft gear should be aligned.

If timing marks are not aligned, remove timing pin and continue to rotate engine until marks align. Timing pin should enter hole in flywheel. Engine will be locked at No. 1 “TDC-Compression” stroke.

3.      Remove rocker arm assembly and push rods. See REMOVE CYLINDER HEAD SERIAL NUMBER ( — 199,999) in Group 020, or see REMOVE CYLINDER HEAD SERIAL NUMBER (200,000— ) in Group 021.

4.      When removing camshaft with engine on rollover stand, roll engine to a position where followers fall away from camshaft lobes (oil pan side up) or hold cam followers away from lobes with D15001NU Magnetic Holding Set.

Timing Marks—Camshaft and Crankshaft Gears

A—Timing Marks

away from lobes with D15001NU Magnetic Holding Set.

Timing Marks—Camshaft and Crankshaft Gears

A—Timing Marks

5. Examine both camshaft gears (A) and injection pump drive gear (B) for worn or damaged gear teeth. Gears should have a minimum backlash as follows:

Specification

Camshaft Gear-to-Injection Pump

Drive Gear Backlash—Backlash ............. 0.051 mm (0.0020 in.) minimum

NOTE: Timing marks on crankshaft and camshaft gear should be aligned and No. 1 cylinder locked at “TDC Compression” stroke when removing camshaft.

A—Camshaft Gear B—Injection Pump Drive Gear

Remove Camshaft Gears

IMPORTANT: Prevent camshaft from striking floor when pushing camshaft nose out of gear. Camshaft may be damaged if it is allowed to fall to the floor.

NOTE:  Camshaft gears are pressed onto the camshaft.

Removal of gears from camshaft will require approximately a 10-ton press.

1.      Support outer camshaft gear (A) in a press.

2.      Remove outer gear from camshaft.

3.      Support inner camshaft gear (B) in a press.

4.      Remove inner gear from camshaft.

5.      Clean camshaft and gears in solvent. Dry with compressed air.

Removing Outer Camshaft Gear

A—Outer Camshaft Gear B—Inner Camshaft Gear

Measure Thrust Washer Thickness

1.      After removal of camshaft, check the two thrust washers individually for proper thickness.

Specification

Thrust Washer—Thickness .................  2.24—2.34 mm (0.088—0.092 in.)

2.      Replace washers if worn or damaged.

Inspect and Measure Camshaft Followers

1.      Inspect camshaft followers for uneven wear or damage. Also inspect corresponding camshaft lobe for wear or damage. Replace as necessary.

2.      Measure follower O.D. and follower bore I.D. in cylinder block.

Specification

Camshaft Follower—OD......  17.33—17.35 mm

(0.682—0.683 in.)

Camshaft Follower Bore in      Inspecting Camshaft Followers

Block—ID......  17.384—17.440 mm

(0.6845—0.6865 in.)

Replace cam followers that are not within specification. Replace cylinder block if any one follower bore is not within specification.

Visually Inspect Camshaft

1.  Clean camshaft in solvent. Dry with compressed air.

2. Inspect all camshaft lobes (A) and journals (B) for wear or damage. Replace camshaft as necessary. New camshaft followers can be used with old camshaft (if camshaft is serviceable). DO NOT reuse old camshaft followers with a new camshaft.

NOTE: Very light score marks may be found but are acceptable if valve lift is within specification. Pitting or galling dictates replacement. (See CHECK VALVE LIFT SERIAL NUMBER ( —

199,999) in Group 020 or see CHECK VALVE LIFT SERIAL NUMBER (200,000— ) in Group 021.)

Measure Camshaft Journal O.D. and Bushing I.D.

1.      Measure each camshaft journal O.D. If camshaft journal O.D. is not within specification, install a new camshaft.

2.      Measure each camshaft bushing I.D. when installed in cylinder block.

Compare measurements with specs given below. Replace camshaft and bushings as needed.

Measuring Camshaft Journals

Specification

Camshaft Journal—OD ....  66.987—67.013 mm

(2.6373—2.6383 in.) new Camshaft Bushing—I.D. .......  67.076—67.102 mm

(2.6408—2.6418 in.) new

Measure Camshaft Lobe Lift

Measure each camshaft lobe at its highest point and at its narrowest point. Subtract narrowest dimension from highest dimension to find camshaft lobe lift.

If camshaft lobe lift is not within the wear specification on any one lobe, install a new camshaft.

Specification

Intake Camshaft Lobe—Lift................. 7.69—7.79 mm (0.303—0.307 in.) Wear Limit ....  7.19 mm (0.283 in.)

Exhaust Camshaft Lobe—Lift.............. 8.25—8.35 mm (0.325—0.329 in.) Wear Limit ......  7.75 mm (0.305 in.)

Install Camshaft Gears

1.      Support camshaft under first bearing journal in a hydraulic press.

2.      Install Woodruff key (A). Lubricate camshaft nose with LOCTITE 51048 Moly Paste.

3.      Set inner gear (B) on camshaft with thrust washer surface to the inside (toward the camshaft). Align Woodruff key and keyway.

4.      Install gear onto nose of camshaft. Push inner gear on until tight against the camshaft bearing journal.

5.      Set outer gear on camshaft with timing mark upward (away from the camshaft). Align Woodruff key and keyway (C) of outer gear (D).

6.      Push outer gear onto camshaft nose until tight against inner gear.

7.      Support each end of the camshaft on centers. Use a dial indicator with plunger resting on the thrust surface of the camshaft gears.

8.      Check the runout of the inner and outer gear thrust surfaces.

Specification

Camshaft Gear Thrust Surfaces—

Runout ....... 0.10 mm (0.004 in.) maximum

Installing Camshaft Inner Gear

Installing Camshaft Outer Gear

A—  Woodruff Key B—Inner Gear C—Keyway D—Outer Gear

Service Camshaft Bushings Using JDG602 Adapter Set

1.       Inspect camshaft journals and bushings for wear or damage. Measure cam journals and bushings to determine if proper oil clearance exists. Replace camshaft and/or bushings as necessary.

Specification

Camshaft Bushing—ID .....  67.076—67.102 mm

(2.6408—2.6418 in.)

Bore in Block ......

69.987—70.013 mm

(2.7554—2.7564 in.)

Camshaft Bore—Runout ...... 0.038 mm (0.0015 in.) maximum Camshaft Journal—OD ......  66.987—67.013 mm

(2.6373—2.6383 in.)

Camshaft Bushing-to-Journal—Oil

Clearance .....  0.063—0.115 mm

(0.0025—0.0045 in.)

Removing Camshaft Bushings

NOTE: The front two bushings can be reached from the front of the engine. The flywheel and rear  camshaft bore plug (G) must be removed to reach the other two bushings.

2.       Remove camshaft bushings (F) using JDG603 Bushing Driver (E) and JDG604 Receiver Cup (D) along with  the components shown from JDE6 Camshaft Bushing Replacement Set (A and C).

3.       Tighten nut on end of bushing screw until bushing is pulled out of camshaft bushing bore. Inspect and measure camshaft bushing bore in block (B). Follow same procedure for remaining bushings to be replaced.

Camshaft Rear Bore Plug

A—  Bushing Screw (JDE6-1) B—Cylinder Block Web C—Lock Bushing (No. 25916) D—Receiver Cup (JDG604) E—Bushing Driver (JDG603) F—Camshaft Bushing G—Camshaft Bore Plug

Service Camshaft Bushings Using JDG606 Adapter Set

1.        Inspect camshaft journals and bushings for wear or damage. Measure cam journals and bushings to determine if proper oil clearance exists. Replace camshaft and/or bushings as necessary.

Specification

Camshaft Bushing—ID .....  67.076—67.102 mm

(2.6408—2.6418 in.)

Bore in Block ....

69.987—70.013 mm

(2.7554—2.7564 in.)

Removing Camshaft Bushings

Camshaft Bore—Runout .......... 0.038 mm (0.0015 in.) maximum Camshaft Journal—OD .......  66.987—67.013 mm

(2.6373—2.6383 in.)

Camshaft Bushing-to-Journal—Oil

Clearance ..........  0.063—0.115 mm

(0.0025—0.0045 in.)

NOTE: The front two bushings can be reached from the front to the engine. The flywheel and rear  camshaft bore plug (G) must be removed to reach the other two bushings.

Lubricate O-ring on JDG608 Bushing Pilot with clean engine oil before installing in cylinder block web (C).

2.        Remove camshaft bushings (B) using JDG607 Bushing Driver (A) and JDG408 Slide Hammer Adapter (D)  (from JDG405 camshaft Bushing Service Set). Also  use JDG608 Bushing Pilot (E), and D01299AA Slide Hammer (F).

NOTE:  End bushing at front and rear of cylinder block  may be removed with just JDG607 Bushing Driver and D01299AA Slide Hammer.

3.        Inspect and measure each camshaft bushing bore in block as bushings are removed.

Camshaft Rear Bore Plug

A—Bushing Driver (JDG607) B—Camshaft Bushing C—Cylinder Block Web

D—Slide Hammer Adapter (JDG408) E—Bushing Pilot (JDG608)

F—Slide Hammer (D01299AA) G—Camshaft Bore Plug

IMPORTANT:  Oil holes in bushings and cylinder block must be aligned after installation. The elongated hole in bushing must be toward the top. After installation, use a small mirror with extension to be sure oil holes are properly aligned.

4.        Slide a new camshaft bushing (B) onto JDG603 Bushing Driver (A). With JDG608 Bushing Pilot installed in outside cylinder block web (C), assemble D01299AA Slide Hammer (E) and JDG408 Slide Hammer Adapter (D) with bushing driver as shown.

5.        Be sure bushing is started square in bore and oil holes are aligned with holes in block. Pull bushing into bore with slide hammer until properly positioned.

6.        Check bushing-to-cylinder block oil hole alignment using a small mirror with extension.

7.       Apply PERMATEX AVIATION (Form-A-Gasket No. 3) to new camshaft bore steel cap plug and install plug in bore. Plug edge must be seated below edge of  bore.

 Install Camshaft

IMPORTANT: Set engine at TDC of No. 1 piston’s compression stroke before installing camshaft so timing marks on camshaft and crankshaft gears will be aligned.

1.        If camshaft followers were removed with engine on a rollover stand, reinstall followers but do not obstruct camshaft bore. Roll engine to an angle where followers fall away from camshaft bores.

NOTE: If D15001NU Magnetic Holding Tool Set is used, hold camshaft followers away from camshaft bore until camshaft is installed.

2.        Lubricate thrust washer (A) with TY6333 or TY6347 High Temperature Grease and install on camshaft behind inner gear.

3.        Lubricate camshaft lobes with TY6333 or TY6347 High Temperature Grease and bearing journals with clean engine oil.

4.        Carefully install camshaft in cylinder block so that camshaft lobes do not drag in bores. Rotate camshaft during installation to avoid obstruction in any bore.

Camshaft Thrust Washer

A—Thrust Washer

 5. With No. 1 piston on “TDC” compression, align timing marks (A) on camshaft and crankshaft gears. Check injection pump timing.

A—Timing Marks

在既定的燃烧室与喷油设备条件下,柴油的蒸发性决定了混合气形成的速度与质量,高速柴油机混合气形成时问极短,故对柴油的蒸发性有较高要求。柴油蒸发性主要是用馏程与闪点来评价的。

     (l)馏程 测定柴油馏程的方法与测定汽油馏程的方法大致相同,所不同的只是柴油馏程的测定项目有50%、90%和95%馏

出温度。柴油的馏程是按GB/T6536一86(91)的规定进行。甘孜Perkins帕金斯1506A-E88TAG4约翰迪尔John Deere柴油机销售售后代理商费用报价单,齐齐哈尔Perkins帕金斯2206D-E13TAG3约翰迪尔John Deere柴油机柴油机油空气滤清器企业,周口Perkins帕金斯404A-22G1约翰迪尔John Deere柴油机曲轴前后油封网站,保定Perkins帕金斯1106D-E70TAG5约翰迪尔John Deere柴油机曲轴前后油封一台多少钱,文山Perkins帕金斯403F-15约翰迪尔John Deere柴油机偏心轴一台多少钱,咸宁Perkins帕金斯4008-30TAG3约翰迪尔John Deere柴油机曲轴一般多少钱,承德Perkins帕金斯,2206A-E13TAG6约翰迪尔John Deere柴油机进排气门、垫圈哪里有,乌海Perkins帕金斯1204E-E44TTAG2约翰迪尔John Deere柴油机柴油机油空气滤清器多少钱,廊坊卡特C15约翰迪尔John Deere柴油机原厂配件联系,甘肃Perkins帕金斯1206F-E70TTAG3约翰迪尔John Deere柴油机曲轴大概的价钱,延边Perkins帕金斯2206D-E13TAG3约翰迪尔John Deere柴油机活塞、活塞环联系,台南Perkins帕金斯1103D-33TA约翰迪尔John Deere柴油机哪里有做维修保养的多少钱,菏泽Perkins帕金斯403A-15G2约翰迪尔John Deere柴油机油水分离器一般多少钱,

50%馏出温度越低说明柴油中的轻质馏分含量多,柴油机易于起动。但柴油中轻质馏分含量过多,会使喷入气缸的柴油蒸发太快,易引起全部柴油迅速燃烧,造成压力剧增,使得柴油机工作粗暴。

90%与95%馏出温度越低,说明柴油中重质馏分含量低,这就使得柴油的燃烧更加充分,不仅可以提高柴油机的动力性,减少机械磨损.避兔约翰迪尔John Deere柴油机产生过热现象,而且还可使油耗降低。

由上可知,柴油的馏分过轻、过重都是不适宜的。GB252一87规定柴油的50灯馏出温度不高于300'C;90%馏出温度不高于355’C;95%馏出温度不高于365'C。当然,不同类型的柴油机对柴油馏分的要求也不同,预燃室式和涡流室式柴油机,可以允许使用馏分较宽、较重的柴油;而直喷式柴油机则只能使用馏分较窄、较轻的柴油。(2)闪点 闪点是石油产品在一定试验条件下加热后,当油料蒸气与周围空气形成的混合气接近火焰时,开始发出闪火时的温度。根据测定仪器之不同,又分为开口闪点与闭口闪点两种。液体燃料多采用闭日闪点,在同样条件下闭日闪点要比开日闪点约低10C一20C。柴油的闪点是测其闭口闪点,测定时按GB/T261一83的规定进行。方法概要:试,样在连续搅拌的条件下用很慢的恒定速率加热,在规定的温度间隔,同时中断搅拌的情况下,将一小火焰引入杯内。试验火焰引起试样上的蒸气闪火时的**低温度作为闪点。

柴油的闪点既是控制柴油蒸发性的指标,也是确保柴油安全性的指标。闪点低的柴油,其蒸发性好,但柴油的闪点也不能过低。因为:其一,闪点过低,则柴油含轻质馏分过多,使得柴油蒸发性过强,会使得气缸内混合气燃烧过猛,气缸压力骤增而致柴油机工作粗暴。其二,柴油的闪点又是柴油储运及使用中的安全指标.对柴油闪点的要求随约翰迪尔John Deere柴油机的工作条件和油箱的位置而不同。汽车、工程机械等多在露天工作与加油,对闪点要求相对而言不是十分严格。而对于一些固定式柴油机八由箱多在室内,对闪点的要求就较严格,不可过低八以确保安全。柴油在使用前如需预热,其加热温度应低于其闪点10C一20C。